Overview
Pre Test Checklist
Setting Inlet Temperature
Analyzer Connections
Emptying & Cleaning the In-Line Water Trap
Changing The Particle Filter
Quick Start
Fresh Air Purge
Measuring Flue Gases
Display Parameters
Status Screen
Status Bar
Status Bar Icons ...................................10
Status Bar Icon Layout ..............................10
Status Bar Menu Options ............................10
Status Bar Options Table ............................10
Menu
Using the Menu ...................................11
Stored Logs Memory
Menu Options .....................................12
Heat exchanger test
Printouts
Specifications
Certification
Where to Test
What Results are Generally Acceptable
What Results Are Generally Acceptable ................19
Typical Excess Air Level .............................19
Powering Off
Post Test
General Maintenance
Cold Weather Precautions
Replacing the Batteries
Canadian Annual Recertification Services
Usa Annual Recertification Services
Product Registration
Other Important Factors Relating to Combustion
Combustion Measurement Terms
Nett Temperature ..................................23
• Operating Temperature: 32˚ to 113˚F (0˚ to 45˚C)
• Storage Temperature: 0˚ to 113˚F (-18˚ to 45˚C)
• Operating Humidity: 15% to 90% R.H.
• Back light: Yes
• Dimensions: 8.54 x 4.18 x 1.86 inch
• Item Weight: 1.51 lb
IMPORTANT SAFETY WARNINGS
Read entire Safety Notes section regarding potential hazard and proper instructions before using this analyzer. In this manual the
word “WARNING” is used to indicate conditions or actions that may pose physical hazards to the user. The word “CAUTION” is used to
indicate conditions or actions that may damage this instrument. This analyzer must only be used in well-ventilated locations by trained
and competent persons after due consideration of all potential hazards.
To ensure safe operation and service of the tester, follow these instructions. Failure to observe these warnings can result in
severe injury or death.
• Do not use this analyzer during electrical storms or in wet weather.
• To avoid false readings, charge batteries if a low battery indicator appears.
• Always adhere to national and local safety codes. Use proper personal protective equipment (PPE).
• Calibration: Recommended Annually
• Certification: UK CA, CE Conformity, RoHS, REACH Compliant,
AHRI 1260 standard
• Battery Type: NiMH (AA) 3
• Accuracy: ± (% of reading + # of least significant digits)
This analyzer extracts combustion gases that may be toxic in relatively low concentrations. These gases are exhausted from the
back of the analyzer.
This analyzer is designed for trade professionals who are familiar with the hazards of their trade. Observe all recommended safety
procedures that include proper lockout utilization and use of personal protective equipment that includes safety glasses, gloves and
flame resistant clothing.
Users of portable gas detectors are recommended to conduct a “bump” check before relying on the unit to verify an atmosphere is free
from hazard. A ‘bump” test is a means of verifying that an instrument is working within acceptable limits by briefly exposing to a known
gas mixture formulated to change the output of all the sensors present. This is different from a calibration where the instrument is also
exposed to a known gas mixture but is allowed to settle to a steady figure and the reading adjusted to the stated gas concentration of
the test gas.
A. Infrared Printer Port
B. On/ Off (Power) Button
C. 6 Line Backlit Display
• Press any button to turn Back light on (will turn off after 10 seconds)
D. Protective Rubber Boot With Magnets
E. Status Bar Line
F. Data Hold Button: Short press to hold current data.
G. Pump Toggle Button: Long press to toggle pump on and off
H. UP Button
• Short press to navigate “UP”.
I. Save Log Button: Long press to store data.
J. Print Report Button: Short press to print a report to IR Port. (will enter a print option if Wireless Module is fitted)
K. Down Button
• Short press to navigate “DOWN”
L. ENTER Button
• Short press select current option displayed
• Long press to activate some menu items
M. Rotary Selector Dial
N. Particle Filter (inside water trap)
O. Water Trap
P. LED Full Water Trap Indicator
Q. Serial Number: (under Protective Boot)
R. Sensors Fitted: (under Protective Boot) Indicates Sensors fitted in unit
S. Battery Compartment: (under Protective Boot)
T. Grip Indentation: Indentation for fingers to grip analyzer
U. Water Trap Drain Plug (Red plug; take caution NOT to damage plug when removing protective boot)
V. Battery Charge USB Adapter Connection
W. Temperature Connections
The direct measurement of CO2 is achieved using UEi’s own EOS technology sensor. CO2 is set to zero in fresh air automatically after
the initial 60 second countdown.
If “ZERO CO2” is indicated, ensure the unit is in outside fresh air before selecting the “Purge” option.
It is very important that re-zeroing is done in outside fresh air as indoor CO2 levels are affected by human breath.
The analyzer has a protective rubber boot with magnets for hands-free operation and is supplied with a probe with an integral
temperature sensor.
A low flow detection system warns of a low flow and switches the pump off, this also helps prevent water condensate ingress from
overfilled water traps.
A large 6 line display provides the user with relevant information based on current activity including instrument status via the new
intelligent Status Bar. All data can be printed via an optional infrared printer.
The C161 uses a new data storage system allowing up to 30 logs of any combination of Combustion, AUX or Temperature tests, rather
than be restricted to an allowance of particular logs.
10 characters can be added to Line 1 of the header, 6 characters to Line 2 of Header of the printouts.
PRE TEST CHECKLIST
• Clean particle filter
• Water trap and probe line are empty of water
• Power on and zero
• All hose and thermocouple connections are properly secured
• Flue gas probe is sampling ambient FRESH air
• Water trap is fitted correctly to the instrument
• Flue temperature plug is connected
• Ensure water trap plug is inserted correctly
SETTING INLET TEMPERATURE
• Turn on and zero the analyzer without the flue probe connected to use ambient temperature.
• Connect flue probe thermocouple to T1 during zero countdown use for inlet ducted system.
• Connect a thermocouple to T2 to measure second temp source.
ANALYZER CONNECTIONS
WARNING!
Turning the pump off while the probe is in the flue will leave toxic gases
inside the analyzer. Once data has been printed or copied, it is advisable
to purge the unit with fresh air as soon as possible. To do this remove the
probe from the flue and turn ON pump. Always allow the readings to return
to zero (20.9% for O
2) prior to shutting the unit off. The meter will not switch
off until the CO reading is below 20 ppm.
WARNING!
The probe will be hot from flue gases. Remove the probe from the flue and
allow it to cool naturally. Do not immerse the probe in water, as this will be
drawn into the analyzer and damage the pump and sensors.
NOTE: Take care when
inserting the temperature
probes as the pins are
polarized. Insert with the
smaller pin (+) to the right.
• Remove the particle filter from its’ spigot and replace
• Slide the water trap back into position and replace protective rubber boot
QUICK START
Turn on the analyzer by pressing the On/Off Button for 2 seconds until the unit activates. As described the analyzer will perform a 60
second turn on purge. Once completed simply select the reading desired by the position of the rotary dial.
FRESH AIR PURGE
Each time the analyzer is turned on it will perform a 60 second air purge, this is to clear
the gas sampling path (including probe, if connected), and self calibrate the CO2
detection system. For these reasons it is very important that the analyzer be in outside fresh air when powered on.
WARNING
When in the Rotary Dial positions AUX, Flue 1 or Flue 2 ; Press the Up or Down Buttons,
scroll to CO2 Zero. On the Purge option, short press the Edit Button, and a 60 second
Purge will begin.
MEASURING FLUE GASES
After the initial countdown is finished and the analyzer is properly setup, put its’ flue probe in the appliance’s sampling point. The tip of
the probe should be at the center of the flue. Use the flue probes depth stop cone to set the position.
With balanced flues, make sure the probe is positioned into the flue so no air can “back flush” into the probe.
NOTE: Ensure the flue probe handle does not get hot!
The large display is backlit with 6 lines, the last line is the Status Bar line.
Menu Screen
Time (settable parameter; HH:MM:SS, displayed in 24 hour clock format)
Date (settable parameter; MM:DD:YY)
Header (16 character, 2 line settable parameter; 10 characters can be added to Line 1 of the header, 6 characters to Line 2)
IR Print (KMIRP or IRP-2)
˚C/˚F (Selectable parameter)
Gas Unit (Selectable parameter; select between ppm(n), ppm, mg/kWh(n), mg/kWh, mgm3(n), mgm3
Language (settable parameter; select between English, Espanol, Francais)
EFF (Efficiency; select between Efgn or Efgc except for Heavy Oil and Pellets)
O2 Ref (Selectable parameter; select between 0.0% to 20.0%)
Logs (if logs are saved, they will be displayed)
Code (for Authorized Service Personnel only)
Status Screen
Ti (Ambient temperature)
ATM (atmospheric pressure in mBars)
CAL (days until next calibration due)
AUX Screen
(Default selections can be changed by user to desired selections; select between O2, CO, Display Fuel Type, CAL, XAIR, LOSS, Efgn or
Efgc, ATM, Ti, ∆T, T2, T1, CO2, COa, or COn for each line)
Default Selections Are:
O2 (displayed in %)
CO (displayed in ppm)
CO2 (displayed in %)
T1 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
T2 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
T1 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
T2 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
CO/CO2 Screen
CO (displayed in ppm)
COa (O2++ displayed in ppm)
CO2 (displayed in %)
Loss (displayed in %)
XAIr (Excess Air, O2++ displayed in ppm)
Temp Screen
T1 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
T2 (displayed in ˚F or ˚C, depending on selection in Menu Screen)
∆T (Differential Temperature, displayed in ˚F or ˚C, depending on selection in Menu Screen)
Purge option
When the Rotary Dial is in AUX, O2/Eff or CO/CO2 ; Press the or Buttons to scroll to CO2 Zero. Press and hold to select.
Press to start a 60 second Purge.
STATUS SCREEN
Select “Status” on the dial to view the following:
Current fuel selection. Use status bar to change fuel selection.
Select between: Pellets, Light Oil, Heavy Oil, LPG, Butane, Propane, Natural Gas, Bio Oil
Ambient temperature around the analyzer.
Current atmospheric pressure (mBar).
Shows number of days until next calibration is due.
Status Bar.
User Interface
The large six-line display will indicate 5 lines and the status bar (see pg. 9) the backlight will activate on each button press and turn off
after 10 seconds of no activity. Navigation through the various start options and menu system is via the 3 button dedicated Up, Down &
Enter Buttons. Button presses are categorized short press and long press (in the same manner as many modern consumer electronics).
Status Bar
The Status Bar provides the user with a concise indication of the instrument status, it incorporates an intelligent system that
understands what the user is currently viewing on the display offering appropriate menu items as well as standard menu items.
Navigation through the Status Bar options is achieved via the and buttons when the Status Bar is visible on the display.
The icons are designed to provide quick and simple instrument status information without having to navigate complicated menu
systems or detract from the job at hand.
Status Bar Icon Layout
Pump
Pump
Sending Data
Battery
Status Bar Menu Options
The Status Bar will offer the user Menu items based on the Selector Dial setting.
Status Bar Options Table
Status Info AvailableSTATUSAUXO2/EffCO/CO2TEMP
TIME
FLUE SELECTED
DATE
CO2 FLUE
44444
44444
44444
Pump on
Pump paused
Indicates data is being transmitted to either the App or the Printer
The Menu position on the Rotary Dial allows for the customization of the default settings for the analyzer as per the user’s
requirements. Navigation through the Menu system is via the dedicated user’s interface buttons (Up, Down, Enter).
Menu Option to edit
As you navigate up or down through the Menu, the items will scroll accordingly, eventually back to the beginning.
Rotate Selector Dial to MENU to set up or customize your settings.
Selected parameter are centered, highlighted with arrow icons on either side.
Use and buttons to scroll menu options,
Press
to a select a parameter to edit. Press button to scroll fields to change .
Press and buttons to change field contents.
Press to enter content selected.
Menu Items
MENUSub MenuOPTIONS/COMMENTS
Time
Date
Header
IR Print
Temperature Scale
Gas Unit
Language
Efficiency
O2 refUsed for "Normalized" readings. Default set to 3%, can be adjusted up or down.
Logs
CodePassword protected for authorized service agents only/ LEAVE SET TO "0000".
HH:MM:SS
DD/MM/YY
LINE 1
LINE 2
EXIT
KMIRP
IRP-2
˚C
˚F
ppm
ppm(n)
mg/m3
mg/m3(n)
mg/kWh
mg/kWh(n)
English
Espanaol
Francais
Gross
Nett
VIEW
DELETE ALL
EXIT
24 Hour Format (e.g. 7AM = 0:00:00, 7PM = 19:00:00)
Customer info displays on print outs
Customer info displays on print outs
Select to print to KMIRP
Select to print to IRP-2
Select ˚F or ˚C.
The C161 utilizes a shared memory system much like a computer hard drive. The different Log types are stored sequentially until the
shared memory area is full. This means the log types are not restricted to a smaller number of memory locations as the full memory
capacity is available as required for Logs of any type.
To view the current memory usage status simply navigate to menu -----> LOGS, press the button to select the Log desired.
Number of stored Combustion Logs
Number of stored Auxiliary Logs
Number of stored Temperature Logs and “Pressure if fitted”
Total Memory Used
Menu Options
Menu Options
View stored Logs, this will enter the secondary menu to select the type of log to view
(will only appear if data available).
Delete all stored Logs. To delete “long press” the button (will only appear if data
available).
NOTE: Test results; O2, CO and Excess Air will show on the printout.
There are many methods to test heat exchanger integrity. One of these is to observe the Excess Air, O2 and CO readings both before
and after the blower turns on. If the heat exchanger is sealed your O2 and CO readings should remain fairly stable. A breach in the heat
exchanger may allow fresh air to be forced into the flue after the blower turns on due to a pressure increase in the plenum. The result
may be a rise in the measured O2 in the stack gas and an increase in the Excess Air . In some sealed systems the fresh air drawn in
through the breach may reduce the combustion air available leading to an increase in the CO reading. If either of these situations are
present it is probable that there is a problem with the Heat Exchanger which may require additional testing and inspection.
NOTE: Many cracks are invisible to borescopes or the naked eye, and only open or separate from pressure or temperature changes
during operations.
Select the Exch Test rotary dial position. Call for heat on the system. Observe and wait for O2 readings to stabilize.
Press for Exchange Press for Run Press for Start
In Heat Exch Setup Screen, select Fuel type (Natural Gas, Bio Oil, Heavy Oil, Pellets, Light Oil, LPG,
Butane, Propane)
In Blower Off mode, In Blower ON mode, Test results will appear Press or to select
Press to start test it will count down on screen Press Run, View or Delete all
Rotate selector Dial to Menu Position.
Use or buttons to scroll to IR PRINT.
Press button.
Use or buttons to select either IRP-2 or KMIRP (KMIRP2)
printer.
Press button to save selection.
Printing
To print, simply press and release the PRINT BUTTON. Printing can
be aborted by pressing the PRINT BUTTON again.
UEi Infrared Printer
Make sure the printer is switched on, ready to accept data and its
infrared receiver is in line with the analyzer’s infrared emitter (on top
of the analyzer).
Flue Temperature
Inlet Temperature (Internal Sensor)
Inlet Temperature (External Sensor)
Flue Gas Measurement
Carbon Monoxide
Carbon Dioxide
Calculations
Oxygen
CO/CO2 Ratio
Efficiency (Nett or Gross)
Efficiency High (C)
Excess Air
Pre-programmed FuelsPellets, Light Oil, LPG, Butane, Propane, Natural Gas, Bio Oil, Heavy Oil
Battery Life>8 hours (continuous with pump on)
CertificationThe C161 is TUV-tested and certified to EN 50379, Parts 1-3 in accordance to 1st German Feder-
Operating Conditions
Temperatures
Humidity
Power SupplyRechargeable batteries, USB Charging
Physical Characteristics
Weight
Dimensions
32˚ to 1112˚F (0˚ to 600˚)
32˚ to 122˚F (0 to 50°C)
32˚ to 1112˚F (0˚ to 600˚)
0 - 2000ppm
0 - 20%
0 - 21%
0 - 0.9999
0 - 99.9%
0 - 119.9%
0 - 119.9%
al Emission Control Ordinance (Bim5chV)
32˚ to 113˚F (0˚ to 45˚C)
15 to 90% RH, (non-condensing)
1.5 lb. (635g)
H: 8.54”x W: 4.18”x D: 1.86” (H: 217 mm x W:106 mm x D: 47mm)
0.1˚F (0.1˚C)
0.1˚F (0.1˚C)
0.2˚ (0.1˚C)
1ppm
0.1%
0.1%
0.0001
0.1%
0.1%
0.1%
±(0.3% rdg +3.6˚F (2˚C))
±2˚F (1˚C)
1˚F (0.5˚C)
±3ppm or ±5% of Reading
(whichever is greater)
±0.3% Volume
±0.3% Volume
±5% of Reading
±1% of Reading
±1% of Reading
±0.2% of Reading
The C161 is in conformity with the relevant Union harmonization legislation listed below:
DirectiveTitle
201430EUElectromagnetic Compatibility (EMC)
201165EURestriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS)
The following harmonized standards and technical specifications have been applied:
CERTIFICATION
The UEi C161 is TUV-tested and certified to EN 50379, Parts 1, 2 & 3 in accordance to 1st German Federal Emission Control Ordinance
(BlmSchV). Manufactured to meet
3 to 9% O
Stack temperature325˚F to 500˚F275˚F to 500˚F325˚F to 600˚F
Draft (Water Column Inches)-.02 to -0.4 InWC-.02 to -0.4 InWC-.04 to - 0.6 InWC-.02 to -0.4 InWC
Carbon Monoxide (parts per million)<100 ppm<100 ppm<100 ppm<100 ppm
Overfire Draft (Water Column Inches)-.02 InWC-0.2 InWC0.4 to 0.6 InWC
Smoke0 (manufacturer's
recommendation)
NOTE: Follow manufacture guidelines for the specific equipment being serviced
When you power off the C161, there is a 10 second purge.
Make sure you do not exceed the analyzer’s operating specifications. In particular:
• Do not exceed the flue probes maximum temperature (1112˚F)
• Do not exceed the analyzer’s internal temperature range
• Do not put the analyzer on a hot surface
• Do not exceed the water trap’s level
• Do not let the particle filter become dirty and blocked
View the displayed data to ensure that the stable operating conditions have been achieved and the readings are within the expected
range.
POST TEST
Remove the probe from the flue and allow analyzer to purge with fresh air
until readings return to zero. O2 to 20.9%, CO to Zero (Be careful the probe
tip will be HOT).
GENERAL MAINTENANCE
• Re-certify your instrument annually to ensure it meets original performance specifications.
PERIODIC SERVICE
WARNING
Repair and service of this instrument is to be performed by qualified personnel only. Improper repair or service could
result in physical degradation of the instrument. This could alter the protection from personal injury this meter provides
to the operator. Perform only those maintenance tasks that you are qualified to do.
• Keep your instrument dry. If it gets wet, wipe dry immediately. Liquids can degrade electronic circuits.
• Whenever practical, keep the instrument away from dust and dirt that can cause premature wear.
• Although your instrument is built to withstand the rigors of daily use, it can be damaged by severe impacts. Use reasonable
caution when using and storing the meter.
It is important you keep your flue gas analyzer in a warm and dry place overnight
Electronic devices that become really cold, by being left in a vehicle overnight, suffer when taken into a warm room the next
morning. Condensation may form which can affect the analyzer’s performance & cause permanent damage. See operating and storage
temperature specifications.
Electrochemical sensors used in flue gas analyzers can be affected by condensation or water being sucked into the analyzer, as the
small apertures on top of sensors can become blocked with water, stopping sensors seeing flue gas. When this happens, oxygen or
carbon dioxide reading will display as “—” & sensors may be permanently damaged
COLD WEATHER PRECAUTIONS
If you think that your analyzer is affected by condensation or water ingress, it may be possible to rectify the problem yourself. Simply
leave the analyzer running in a warm place, with the pump ‘ON’ sampling fresh air for a few hours (use mains adapter/battery charger if
needed). If, after doing this, you still experience problems please contact our Service Center.
This meter has been designed for use with both alkaline and rechargeable Nickel Metal Hydride (NiMH) batteries. No other types are
recommended and will void warranty. The analyzer is supplied with 3 (AA) size NiMH rechargeable batteries. These should be installed
into the instrument.
CAUTION
Take great care when installing the batteries to observe correct polarity.
Always check the meter for operation immediately after installing new batteries.
Using Rechargeable Batteries
The battery charger must only be used when NiMH batteries are fitted. Alkaline batteries are not rechargeable. Attempting to recharge
alkaline batteries may result in damage to the product and create a fire risk.
WARNING
Do not try and charge the unit with Alkaline batteries fitted. Do not mix NiMH cells of different capacities of from
different manufacturers, all cells must be identical.
Turn over the analyzer, remove the protective rubber boot and fit 3 “AA” NiMH rechargeable batteries in the battery compartment. Take
great care to ensure they are fitted with the correct battery polarity. Replace the battery cover and the protective rubber boot.
Time and Date
When changing the batteries, the time and date will need setting.
Battery Disposal
Always dispose of depleted batteries using approved disposal methods that protect the environment.
Battery Charging
Ensure that you use the correct charger. This unit uses a 5V regulated charger. Ensure the batteries are fitted in the correct manner,
and charge for at least 16 hours. Subsequent charges should be overnight. NiMH batteries may be charged at any time, even for short
periods to conduct testing.
WARNING
Under NO circumstances should you expose batteries to extreme heat or fire as they may explode and cause injury.
Always dispose of old batteries promptly in a manner consistent with local disposal regulations.
Request Recertification or Service Online
Within 1 Year of Purchase or Last Service
UEi will:
10 Year Warranty: All UEi combustion analyzers have a standard 1-year
warranty. Each recertification extends the warranty for 1 more year for up to 10 years from the date of purchase.
Contractors who book recertification of a C160 series analyzer at
within 12 months from either the date of
purchase or the date of the last recertification will receive reduced
service pricing that lowers the cost of ownership and 2 additional
benefits:
Same Day Service: All qualifying analyzers received for recertification through
UEi Service+ are returned on the same business day.*
*Analyzers that include the additional NO (Nitric Oxide) sensor requires 48-hour turnaround.
PRODUCT REGISTRATION
Register Online
Registering you analyzer online is quick and easy. Just log in or setup an account, it only takes a couple of minutes. Once logged in you
can register you analyzer by providing some product information and uploading a proof-of-purchase.
When it’s time to request recertifcation, just log into your account, select the analyzer, select the service and place your order.
• Time: Amount of time that the fuel and oxygen are together in the combustion chamber
• Temperature: How high the temperature is determines the rate of oxidation, or spread of combustion
• Turbulence: How well the fuel and air are mixed
These three factors are all interrelated and will move your results along the combustion curves.
COMBUSTION MEASUREMENT TERMS
Other parameters measured include Nett temperature, draft and efficiency.
Nett Temperature
Nett temperature is the difference between the combustion air entering the combustion chamber and the flue gas temperature past
the heat exchange. This is used to determine how efficient the system is extracting heat from the combustion process in addition to
the performance of the combustion process. On sealed systems that have ducted inlet air for combustion air, the Nett temperature
must compare this air stream temperature with the flue gases. If the appliance simply uses room air for the combustion air, our
analyzers have an internal temperature sensor in the handset, so it will use this temperature when calculating Nett temperature. The
most accurate results for efficiency are obtained when measuring flue gases at the point where flue temperature (not flame
temperature) is the highest.
Draft
Draft is the difference between the ambient pressure level and the pressure level in the flue.
This is created either by the natural buoyancy of the hot gases created in combustion lifting, or by an inducer fan that assists the flow
of flue gases up the stack. Most combustion equipment will specify the amount of draft that is required for proper operation. Draft
helps draw combustion air into the combustion chamber, and also helps in mixing the fuel and oxygen. Without proper draft, the
combustion process can spill poisonous by-products into the space where the appliance is located. This can be a risk to those in the
area, or create a danger to residents or employees working near the combustion equipment.
Efficiency
Efficiency is a measure of how well the fuel is burned to create heat, and how well the generated heat is captured for the intended
use. The information used to create this value are based on the fuels heating value, the heat lost up the flue and the gas components
in the flue gas. The original method to determine efficiency included many manual methods and lookup charts. As an example you
would measure the CO2 level and the stack temperature and then reference a slide scale that would give you the relative efficiency
number. UEi’s electronic combustion analyzers perform the measurements on a continuous basis, and can calculate the efficiency
as adjustments are being made. Combine this with a printout and you are able to provide a before and after comparison of the
combustion equipment in relatively little time as part of normal servicing. Combustion efficiency is not the same as AFUE (annual fuel
usage efficiency). AFUE is not measurable with any portable flue gas analyzer.
Combustion Efficiency Calculations
This identifies three sources of loss associated with fuel burning:
•Losses due to flue gases:
Dry Flue gas loss, Moisture and hydrogen,
Sensible heat of water vapor, Unburned gas
• Losses due to refuse:
Combustible in ash, riddling and dust
• Other losses:
Radiation, convection, conduction other unmeasured losses
Nett efficiency calculations assume that the energy contained in the water vapor (formed as a product of combustion and from wet
fuel) is recovered and the wet loss term is zero. Gross efficiency calculations assume that the energy contained in the water vapor
is not recovered. Since the fuel air mixture is never consistent there is the possibility of unburned/partially unburned fuel passing
through the flue. This is represented by the unburned carbon loss. Losses due to combustible matter in ashes, riddling, dust and grit,
radiation, convection and conduction are not included.
CO Air Free
Certain standards ( ANSI Z21.1) for Carbon Monoxide are stated in terms of air-free. Air-free refers to the concentration of CO in combustion gases
undiluted with flue, or other gases containing little CO. This value is computed using an equation that takes into account the O2 concentration of
the flue gas.
• If 5% O2 is measured (O2m) in the flue then the CO gas value will be recalculated as if 0% were measured. The equation for air-free is
as follows:: COaf = CO PPM x [(20.9) / (20.9 - O2m)]
• In our example if a reading of 325 PPM were measured then the air-free value would be calculated as follows:
COaf = 325 PPM x [(20.9) / (20.9 - 5)] COaf = 325 PPM x [(20.9) / (15.9)] COaf = 427
We may be given a limit on our gas range by the local authority, which stated that we must not emit more than 400-PPM Carbon Monoxide airfree. In the example we would be breaking the limit and corrective action should be taken to reduce the level of CO. Air-free values prevent false
readings being submitted, e.g. allowing more air into the boiler will increase the oxygen level in the flue and dilute any toxic gas reading. Air-free
referencing gives readings as if they were undiluted.
Caution: This symbol indicates that equipment and its accessories shall be subject to separate
collection and correct disposal.
CLEANING:
Periodically clean your meters’ case using a damp cloth. DO NOT use abrasive, flammable liquids, cleaning solvents, or strong
detergents as they may damage the finish, impair safety, or affect the reliability of the structural components.
STORAGE:
Remove the batteries when instrument is not in use for a prolonged period of time. Do not expose to high temperatures or humidity.
After a period of storage in extreme conditions exceeding the limits mentioned in the General Specifications section, allow the
instrument to return to normal operating conditions before using it.
WARRANTY:
The C161 is warranted to be free from defects in materials and workmanship for a period of 1 year from the date of purchase. If within
the warranty period your instrument should become inoperative from such defects, the unit will be repaired or replaced at UEi’s option.
This warranty covers normal use and does not cover damage which occurs in shipment or failure which results from alteration,
tampering, accident, misuse, abuse, neglect or improper maintenance. Batteries and consequential damage resulting from failed
batteries are not covered by warranty.
Any implied warranties, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are
limited to the express warranty. UEi shall not be liable for loss of use of the instrument or other incidental or consequential damages,
expenses, or economic loss, or for any claim or claims for such damage, expenses or economic loss.
A purchase receipt or other proof of original purchase date will be required before warranty repairs will be rendered. Instruments out
of warranty will be repaired (when repairable) for a service charge
This warranty gives you specific legal rights. You may also have other rights, which vary from state to state.